--- rblcheck.c.orig	Wed Aug 19 22:47:03 1998
+++ rblcheck.c	Fri Jan 21 10:56:00 2000
@@ -79,6 +79,7 @@
 #include <sys/types.h>
 #include <netinet/in.h>
 #include <arpa/nameser.h>
+#include <arpa/inet.h>
 #include <resolv.h>
 #include <netdb.h>
 
@@ -203,7 +204,7 @@
  * domain. If "txt" is non-zero, we perform a TXT record lookup. We
  * return the text returned from a TXT match, or an empty string, on
  * a successful match, or NULL on an unsuccessful match. */
-char * rblcheck( int a, int b, int c, int d, char * rbldomain, int txt )
+char * rblcheck( struct in_addr a, char * rbldomain, int txt )
 {
 	char * domain;
 	char * result = NULL;
@@ -214,12 +215,15 @@
 	const u_char * cend;
 	const u_char * rend;
 	int len;
+	u_char *p;
+	int i, j;
 
 	/* 16 characters max in a dotted-quad address, plus 1 for null */
 	domain = ( char * )malloc( 17 + strlen( rbldomain ) );
 
+	p = (u_char *)&a;
 	/* Create a domain name, in reverse. */
-	sprintf( domain, "%d.%d.%d.%d.%s", d, c, b, a, rbldomain );
+	sprintf( domain, "%d.%d.%d.%d.%s", p[3], p[2], p[1], p[0], rbldomain );
 
 	/* Make our DNS query. */
 	res_init();
@@ -261,8 +265,8 @@
 	cp = answer + sizeof( HEADER );
 	while( *cp != '\0' )
 	{
-		a = *cp++;
-		while( a-- )
+		i = *cp++;
+		while( i-- )
 			cp++;
 	}
 
@@ -277,8 +281,8 @@
 	cp += ( NS_INT16SZ * 2 ) + NS_INT32SZ;
 
 	/* Get the length and end of the buffer. */
-	NS_GET16( c, cp );
-	cend = cp + c;
+	NS_GET16( i, cp );
+	cend = cp + i;
 
 	/* Iterate over any multiple answers we might have. In
 	   this context, it's unlikely, but anyway. */
@@ -286,10 +290,10 @@
 	rend = result + RESULT_SIZE - 1;
 	while( cp < cend && rp < rend )
 	{
-		a = *cp++;
-		if( a != 0 )
-			for( b = a; b > 0 && cp < cend && rp < rend;
-			  b-- )
+		i = *cp++;
+		if( i != 0 )
+			for( j = i; j > 0 && cp < cend && rp < rend;
+			  j-- )
 			{
 				if( *cp == '\n' || *cp == '"' ||
 				  *cp == '\\' )
@@ -308,23 +312,29 @@
 	char **argv;
 {
 	extern int optind;
-	int a, b, c, d;
+	extern char *optarg;
+	struct hostent *ent;
+	struct in_addr a;
 	int quiet = 0;
 	int txt = 0;
 	int rblfiltered = 0;
 	char * response;
 	struct rbl * rblsites = NULL;
 	struct rbl * ptr;
+	int fail;
+	int c;
 
 	/* Add more sites you want in the default list of RBL-alike
 	   systems here. ### An easier way to change this is needed. ### */
 	rblsites = togglesite( "rbl.maps.vix.com", rblsites );
-	rblsites = togglesite( "rbl.dorkslayers.com", rblsites );
+	rblsites = togglesite( "relays.orbs.org", rblsites );
+	rblsites = togglesite( "dul.maps.vix.com", rblsites );
+	rblsites = togglesite( "relays.mail-abuse.org", rblsites );
 
 	progname = argv[ 0 ];
 
-	while( ( a = getopt( argc, argv, "qtls:c?hv" ) ) != EOF )
-		switch( a )
+	while( ( c = getopt( argc, argv, "qtls:c?hv" ) ) != EOF )
+		switch( c )
 		{
 			case 'q':
 				/* Quiet */
@@ -372,10 +382,20 @@
 		return -1;
 	}
 
-	if( sscanf( argv[ optind ], "%d.%d.%d.%d", &a, &b, &c, &d ) != 4 ||
-	  a < 0 || a > 255 || b < 0 || b > 255 || c < 0 || c > 255 ||
-	  d < 0 || d > 255 )
-	{
+	fail = 0;
+	if (ent = gethostbyname(argv[optind])) {
+		memcpy(&a, ent->h_addr_list[0], sizeof(a));
+		if (ent->h_addr_list[1]) {
+			fprintf(stderr, "%s resolved to mutiple addresses: ",
+				argv[optind]);
+		}
+		fprintf(stderr, "checking %s\n", inet_ntoa(a));
+	} else {
+		if (!inet_aton(argv[optind], &a))
+			fail++;
+	}
+
+	if (fail) {
 		fprintf( stderr, "%s: invalid IP address\n", progname );
 		usage();	
 		return -1;
@@ -383,7 +403,7 @@
 
 	for( ptr = rblsites; ptr != NULL; ptr = ptr->next )
 	{
-		response = rblcheck( a, b, c, d, ptr->site, txt );
+		response = rblcheck( a, ptr->site, txt );
 		printf( "%s%s%s%s%s%s", !quiet && !response ? "not " : "",
 		  !quiet ? "RBL filtered by " : "", !quiet ? ptr->site : "",
 		  txt && response && strlen( response ) && !quiet ? ": " : "",